Adventures with Analog

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Welcome to adventures with analog!

Let me begin by thanking Linear Technology and Mike Engelhardt, the author of LTspice, for providing the worldwide electrical engineering community with such a highly functional and well supported design tool.

Before using any of my models I would suggest taking a quick look at the files: "Waveform_Arithmetic_&_B-sources" and "LTspice_Hot_Keys". The former explains several useful functions and features that were somehow omitted from the help file, including the "Freq" syntax of behavioral sources. It also clarifies which waveform arithmetic functions work with only real or imaginary arguments and lists many previously undocumented internal constants such as an electron's charge, the speed of light and the temperature of absolute zero.

Clearly, in the hands of the development team at Linear Technology, LTspice is quite capable of adeptly modeling very complex power supply control ICs. The models you'll find in this folder are the work of a team of one and, as such, may not be as thoroughly debugged as those from Linear Technology.

My models are generally developed in schematic format and are intended to be used via their accompanying symbol file as hierarchical objects within higher level schematics. This is a very powerful and easy to use feature of LTspice that is worth the small effort required to learn (just place a copy of the hierarchical model's symbol and schematic files in the same directory as the top level design and use the drop-down Top Directory menu to get to the model via the component button on the tool bar).

Index of models to be uploaded:

UC384X series of single output PWM control ICs. UCC38083 (dual output PWM control IC - requires SwitchYard). IR21064 (half bridge driver). TL431A (shunt regulator - very difficult to simulate well). V320LA40B (varistor). An NTC inrush current limiter (with temperature output). A simple photovoltaic panel model. One and two pole generic op amp models with reasonable BW, slew rate limiting, voltage and current limiting, PSRR, noise and power draw from the power supplies (these models will work with "floating" power supplies). A neon light bulb model. An incandescent light bulb model. A basic LISN model. Techniques for simulating conducted EMI. Methods for simulating realistic transformers. Methods for generating average models of switching circuits. Some example switch mode power supplies. Some interesting class d amplifier stuff along with a bass loudspeaker model.

Enjoy and comments welcome -- analog(spiceman)



Commentary, Explanations and Examples

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